是否可以在ElasticSearch的'_source'中包含'_id' [英] Is it possible to include '_id' in '_source' in ElasticSearch

问题描述

通常ElasticSearch文件存储为：

Usually ElasticSearch documents are stored as:

{      
    "_index": "some_index",
    "_type": "some_type",
    "_id": "blah_blah",
    "_score": null,
    "_source": {
        "field_a" : "value_a",
        "field_b" : "value_b"
        ........
}

在查询数据时，是否可以在_source本身中包含_id？例如

Is it possible to include _id in the _source itself while querying the data? e.g.

{
    "_index": "some_index",
    "_type": "some_type",
    "_id": "blah_blah",
    "_score": null,
    "_source": {
        "_id": "blah_blah", // Added in the _source object
        "field_a" : "value_a",
        "field_b" : "value_b"
        ........
}

此外，我可以读取整个对象并手动包含它，但是想知道是否有办法通过ES查询来执行。

Let's assume I do not have control over the data I am writing so cannot insert it in the source. Also, I can read the entire object and manually include it but wondering if there is a way to do so via ES query.

推荐答案

_id字段既不被索引也不存储，这意味着它不存在。
_type字段仅被索引，但不存储。 _id和_type都是弹性搜索的mateata，它们连接在一起作为id＃type（_uid）。

The _id field is neither indexed nor stored, meaning it dosen't really exist. The _type field is only indexed ,but not stored. _id and _type are both matedata of elasticsearch, they concatenated together as id#type(_uid).

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